Malicious PDF — malware analysis report

Static analysis result for SHA-256 282bba8c5810f2d8…

MALICIOUS

PDF

75.3 KB Created: 2021-08-22 09:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6bc31a120ced5308f538db1b2cac3c7c SHA-1: f4aa3d9d6432be75815e041859da3fac8ec6e157 SHA-256: 282bba8c5810f2d81912b5627f98c8eee74ecdded0bfd41f7445961a87789ae2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, characteristic of a link farm used to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest it's part of a phishing or malware distribution campaign, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086c37684da5---vilib.pdf In PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/8db348a1eb2aecd8d89cb259fdfc29da/3295560200.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/vulatepe.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080b0eb8bd6b---jikozunag.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/0adccafffe60a703ce0ce1d3efb9edbf/kalejiwexa.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles//files/24346907407.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaabf99b2a---14643444869.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/68266511446.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/41033444595.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607984eb9187d---87315293430.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160879b0d4df23---53313765288.pdfIn PDF document text
    • http://atek-ent.com/upload/file/maxupanajeletajimonu.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/9q6li043tnrrb3kqup0p9spf1l/92239132075.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/a28a2b6b5c677ff76eee781f2c8e79ce/98363304854.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/gifubobolulexiwasirotab.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/sekojiwuxugupufizemexuze.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160af6f134cf32---zidogilemip.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/cc67614ab09b93ce1512a29cd5e53af9/47227550817.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707d5018f8e---28853896859.pdfIn PDF document text
    • https://arerp.kr/data/file///46308293242.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/zogidiri.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/gadufutitebijiletatope.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/khkf72521se5nabpa7a2a7nrb6/69596940275.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/dowavixazevamijavipog.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aabea459f11---69953533726.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/84790326162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=rudra+cartoon+season+1+episode+14PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC1 19404 bytes
SHA-256: 8d09c3c3f1e53888fca745939b1275b01d544b718b1111aef20fa0380f1348f1
font_01_sfnt_off0000ec4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10463 10736 bytes
SHA-256: d154e4b670bb1c64271f0bdd87f991a77be886b55c4c66e23eb37596033dea5f